Check userland rather kernel arch (#49)

Check userland rather kernel arch, closes #48

Since uname gives the kernel architecture but we need the userland architecture, we check /bin/bash

Author: probonopd

scripts/build-in-container.sh

@@ -32,26 +32,22 @@ echo -ne 'AI\x02' | dd of=runtime-fuse3 bs=1 count=3 seek=8 conv=notrunc
 ls -lh runtime-fuse3
 
 # append architecture prefix
-# since we expect to be built in a Dockerized environment, i.e., either run in a native environment or have it emulated transparently with QEMU, we can just use uname
+# since uname gives the kernel architecture but we need the userland architecture, we check /bin/bash
 # all we have to do is convert uname's expected output to AppImage's semi-official suffix style
-case "$(uname -m)" in
-    x86_64)
-        architecture=x86_64
-        ;;
-    i386|i586|i686)
-        architecture=i686
-        ;;
-    aarch64|arm64v8)
-        architecture=aarch64
-        ;;
-    arm32v7|armv7l|armhf)
-        architecture=armhf
-        ;;
-    *)
-        echo "Unsupported architecture: $(uname -m)"
-        exit 2
-        ;;
-esac
+runtime=$(file -L /bin/bash)
+
+if [[ $runtime =~ 80386 ]]; then
+    architecture=i686
+elif [[ $runtime =~ aarch64 ]]; then
+    architecture=aarch64
+elif [[ $runtime =~ EABI5 ]]; then
+    architecture=armhf
+elif [[ $runtime =~ x86_64 ]]; then
+    architecture=x86_64
+else
+    echo "Unsupported architecture: ${runtime#* }"
+    exit 2
+fi
 
 mv runtime-fuse3 runtime-fuse3-"$architecture"
 cp runtime-fuse3-"$architecture" "$out_dir"/